Intermittent no crank - JeepForum.com
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post #1 of 10 Old 10-25-2021, 05:51 PM Thread Starter
BrianAzWJ
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Intermittent no crank

I've searched this forum and didn't find my specific problem. I have an intermittent no crank and when it first happened I tried the usual "move the shifter" for a neutral safety problem. In the same time frame I also put my foot on the brake pedal and the engine cranked and started. Numerous times since then, all I do is push the brake pedal down a time or two and engine cranks, runs fine. Does anyone know if the crank circuit goes through a brake pedal mounted switch for some reason? Anyone have the schematic?

My GC has been SKIM deleted for several months now so I know thats not that issue, nor does it have anything to do with a voltage issue. Seems pretty definite to be a switch with bad contacts that don't always open or close.

2004 GC limited 4.7l

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post #2 of 10 Old 10-25-2021, 07:02 PM
Soem0
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Many vehicles do this. I honestly have not tried on my jeep. Most tend to run it to the brake light switch. I'll try going out to my wj shortly
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post #3 of 10 Old 10-26-2021, 01:38 AM
Delta0
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Putting your foot on the brake just before you turn the key is always a good idea.
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post #4 of 10 Old 10-26-2021, 08:08 AM
Mr. Bitey
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WJ doesn't have a brake interlock to start that I am aware of, or at least it was disabled on the 4 that I have owned which seems unlikely. It DOES however have an brake interlock to shift from park (required on all vehicles sold in North America since 1992). Of all the vehicles in my past that I can recall, the only ones that had an interlock to start were manual transmissions, and that was on the clutch pedal not the brake. The clutch interlock was a really simple device - the switch was obvious if you looked under the pedal, and easily bypassed.

2004 WJ 4.7 N, daily driver
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post #5 of 10 Old 10-26-2021, 01:53 PM Thread Starter
BrianAzWJ
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I'll have to take a look and see what I can see for switches down there. I thought someone might have access to schematics and could take a look for such a switch.
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post #6 of 10 Old 10-29-2021, 12:56 PM Thread Starter
BrianAzWJ
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Does anyone have access to the schematic for the brake light switch on my 2004 GC limited?
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post #7 of 10 Old 10-30-2021, 01:06 PM
Delta0
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Quote:
Originally Posted by BrianAzWJ View Post
Does anyone have access to the schematic for the brake light switch on my 2004 GC limited?
..................
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post #8 of 10 Old 11-01-2021, 09:50 AM Thread Starter
BrianAzWJ
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Thanks for the schematic. I looked at my switch and it has 6 wires. I assume 2 are for the brake lights, another 2 are for cruise control & not sure about the last 2 but regardless, I unplugged it and the engine starts normally. So, on to the crank circuit but of course it won't do it when I want it to. I've got a buddy looking to see if he can print a schematic for me. Does anyone know if there is a site where you can download an entire schematic?
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post #9 of 10 Old 11-01-2021, 12:35 PM
jtpeters
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I pulled all the Brake Lamp Switch schematics I had in my 2004 Service Manual.
Hope it helps.
Attached Files
File Type: pdf Brake Light Switch - All Schematics.pdf (1.05 MB, 4 views)

2004 Jeep Overland WJ 4.7 H.O. (Bought new in Oct 2003)
2014 Jeep Overland WK2 5.7 Hemi (Bought used in 2016 w/7k miles)
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post #10 of 10 Old 11-01-2021, 01:51 PM Thread Starter
BrianAzWJ
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Thanks jtpeters! Unfortunately I've moved on from the brake light switch. Any chance you can do the same for the crank circuit?
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